Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with a first image of an animated graphical user interface showing our new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof; and,

FIG. 5 is a fifth image thereof.

The appearance of the animated graphical user interface sequentially transitions between the images shown in FIG. 1 through FIG. 5 . The process or period in which one image transitions to another forms no part of the claimed design.

The outermost broken lines shown in the drawings represent the display or screen or portion thereof with animated graphical user interface that form no part of the claimed design. The broken lines in the animated graphical user interface illustrating portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 